Bump JamesIves/github-pages-deploy-action from 4.7.2 to 4.7.3 (#225)

Bumps [JamesIves/github-pages-deploy-action](https://github.com/jamesives/github-pages-deploy-action) from 4.7.2 to 4.7.3.

Author: dependabot[bot]

.github/workflows/publish.yaml

@@ -21,7 +21,7 @@ jobs:
         run: cd docs && mdbook build && touch book/.nojekyll
 
       - name: Publish documentation
-        uses: JamesIves/[email protected].2
+        uses: JamesIves/[email protected].3
         with:
           branch: gh-pages
           folder: docs/book/